Automatically convert .livemd links

lib/ex_doc/formatter/html.ex

@@ -366,7 +366,7 @@ defmodule ExDoc.Formatter.HTML do
 
         _ ->
           raise ArgumentError,
-                "file extension not recognized, allowed extension is either .md, .txt or no extension"
+                "file extension not recognized, allowed extension is either .livemd, .md, .txt or no extension"
       end
 
     {title_ast, ast} =

lib/ex_doc/language/elixir.ex

@@ -439,7 +439,7 @@ defmodule ExDoc.Language.Elixir do
   defp build_extra_link(link, config) do
     with %{scheme: nil, host: nil, path: path} = uri <- URI.parse(link),
          true <- is_binary(path) and path != "" and not (path =~ @ref_regex),
-         extension when extension in [".md", ".txt", ""] <- Path.extname(path) do
+         true <- Path.extname(path) in [".livemd", ".md", ".txt", ""] do
       if file = config.extras[Path.basename(path)] do
         fragment = (uri.fragment && "#" <> uri.fragment) || ""
         file <> config.ext <> fragment

test/ex_doc/language/elixir_test.exs

@@ -218,10 +218,12 @@ defmodule ExDoc.Language.ElixirTest do
     end
 
     test "extras" do
-      opts = [extras: %{"Foo Bar.md" => "foo-bar"}]
+      opts = [extras: %{"Foo Bar.md" => "foo-bar", "Bar Baz.livemd" => "bar-baz"}]
 
       assert autolink_doc(~m"[Foo](Foo Bar.md)", opts) == ~m"[Foo](foo-bar.html)"
 
+      assert autolink_doc(~m"[Bar](Bar Baz.livemd)", opts) == ~m"[Bar](bar-baz.html)"
+
       assert autolink_doc(~m"[Foo](Foo Bar.md)", [ext: ".xhtml"] ++ opts) ==
                ~m"[Foo](foo-bar.xhtml)"